Spermatogenesis is driven by testosterone production in the Leydig cells of the testes. Under the influence of Leutinizing Hormone (LH ) and Follicle Stimulating Hormone (FSH) which are released from the anterior pituitary, the testes begin to produce sperm in a four- step process of development; spermatogonia, spermatocyte, spermatid, and spermatozoon.